Add CTS telemetry harness support

Migrates harness support files added in
https://chromium-review.googlesource.com/c/chromium/src/+/3541414
into Dawn's repo.

Tested in
https://chromium-review.googlesource.com/c/chromium/src/+/3537743

Bug: chromium:1306640
Change-Id: I3000b1223219a1da293af910bf442570b70b7c92
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/84043
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>

webgpu-cts/scripts/list.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python
+#
+# Copyright 2022 The Dawn Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import argparse
+import logging
+import os
+import shutil
+import sys
+import tempfile
+
+from dir_paths import node_dir
+
+from compile_src import compile_src_for_node
+
+
+def list_testcases(query, js_out_dir=None):
+    if js_out_dir is None:
+        js_out_dir = tempfile.mkdtemp()
+        delete_js_out_dir = True
+    else:
+        delete_js_out_dir = False
+
+    try:
+        logging.info('WebGPU CTS: Transpiling tools...')
+        compile_src_for_node(js_out_dir, [
+            '--incremental', '--tsBuildInfoFile',
+            os.path.join(js_out_dir, 'build.tsbuildinfo')
+        ],
+                             clean=False)
+
+        old_sys_path = sys.path
+        try:
+            sys.path = old_sys_path + [node_dir]
+            from node import RunNode
+        finally:
+            sys.path = old_sys_path
+
+        return RunNode([
+            os.path.join(js_out_dir, 'common', 'runtime', 'cmdline.js'), query,
+            '--list'
+        ])
+    finally:
+        if delete_js_out_dir:
+            shutil.rmtree(js_out_dir)
+
+
+# List all testcases matching a test query.
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--query', default='webgpu:*', help='WebGPU CTS Query')
+    parser.add_argument(
+        '--js-out-dir',
+        default=None,
+        help='Output directory for intermediate compiled JS sources')
+    args = parser.parse_args()
+
+    print(list_testcases(args.query, args.js_out_dir))